Fermi surface of superconducting LaFePO determined from quantum oscillations

Phys Rev Lett. 2008 Nov 21;101(21):216402. doi: 10.1103/PhysRevLett.101.216402. Epub 2008 Nov 20.

Abstract

We report extensive measurements of quantum oscillations in the normal state of the Fe-based superconductor LaFePO, (T(c) approximately 6 K) using low temperature torque magnetometry and transport in high static magnetic fields (45 T). We find that the Fermi surface is in broad agreement with the band-structure calculations with the quasiparticle mass enhanced by a factor approximately 2. The quasi-two-dimensional Fermi surface consists of nearly nested electron and hole pockets, suggesting proximity to a spin or charge density wave instability.